<template>
  <el-container class="home-container">
    <!--  头部区域-->
    <el-header>
      <div class="img">
        <img src="../assets/hm.png" alt="">
        <span>后台管理系统</span>
      </div>
      <el-button  type="info"  @click="logout">退出</el-button>
    </el-header>
    <!-- 页面主题区域 -->
    <el-container>
      <!-- 侧边栏 -->
      <el-aside :width="isCollapse ? '64px' :'200px'">
        <div class="toggle-button" @click="toggleCollapse">|||</div>
        <!-- 侧边栏菜单区域 -->
         <el-menu
      background-color="#333744"
      text-color="#fff"
      active-text-color="#409eff" unique-opened :collapse="isCollapse"
       :collapse-transition="false"
       :router="true"
       :default-active="activePath"
       >
      <!-- 一级菜单 -->
      <el-submenu :index="item.id + ''" v-for="item in menuList" :key="item.id">
        <!-- 一级菜单的模版区域 -->
        <template slot="title">
          <!-- 图标 -->
          <i :class="iconsObj[item.id]"></i>
          <!-- 文本 -->
          <span>{{item.authName}}</span>
        </template>

        <!-- 二级菜单  -->
          <el-menu-item :index="'/'+subItem.path +''" v-for="subItem in item.children" :key="subItem.id"
          @click="saveNavState('/'+subItem.path)"
          >
            <template slot="title">
          <!-- 图标 -->
          <i class="el-icon-menu"></i>
          <!-- 文本 -->
          <span>{{subItem.authName}}</span>
        </template>  
          </el-menu-item>       
      </el-submenu>
     
    </el-menu>
      </el-aside>
      <!-- 右侧内容主体 -->
      <el-main>
        <!-- 路由占位符 -->
        <router-view></router-view>
      </el-main>
    </el-container>
  </el-container>
</template>
<script>
export default {
  data(){
    return {
      // 左侧菜单数据
      menuList:[],
      iconsObj:{
        '125':' iconfont icon-yonghu',
        '103':' iconfont icon-quanxianguanli',
        '101':' iconfont icon-dingdan',
        '102':' iconfont icon-shangpin',
        '145':' iconfont icon-shuju'
      },
      // 是否折叠
      isCollapse:false,
      // 被激活的链接地址
      activePath:''
    }
  },
  created(){
    this.getMenuList(),
    this.activePath = window.sessionStorage.getItem('activePath')
  },
  methods: {
    logout() {
      // 清空token
      window.sessionStorage.clear();
      // 编程式导航跳转到登录页
      this.$router.push("./login");
    },
    // 获取所有的菜单
    async getMenuList() {
      const { data:res } = await this.$http.get('menus')
      if(res.meta.status !==200) return this.$message.error(res.meta.msg)
      this.menuList = res.data
      console.log(res);
    },
    //点击按钮，切换菜单的展开和折叠
    toggleCollapse() {
      this.isCollapse = !this.isCollapse
    },
    // 保存链接的激活状态
    saveNavState(activePath){
      window.sessionStorage.setItem('activePath',activePath)
       this.activePath = activePath
    }
  }
};
</script>
<style lang="less" scoped>
.home-container{
  height: 100%;
}
.el-header{
  background :#373d41;
  display: flex;
  justify-content: space-between;
  padding-left: 0;
  align-items: center;
  color: #ffffff;
  font-size: 20px;
  >div{
    display: flex;
    align-items: center;
    span{
      margin-left: 15px;
    }
  }
}
.el-aside{
  background:#333744;
  .el-menu{
    border-right: 0;
  }
}
.el-main{
  background:#eaedf1;
}
.iconfont{
  margin-right: 10px;
}
.toggle-button{
  background: #4a5064;
  color: #ffffff;
  line-height: 24px;
  font-size: 10px;
  text-align: center;
  letter-spacing: 0.2em;
  cursor: pointer;
}
</style>